Along that same line, I know instructors (and regular divers as well) who overinflate their numbers so incredibly that if they even sat down themselves and calculated what tey claim, they would see how impossible and ridiculous their claims are. They probably count their pool sessions, but even then, according to some of the ones I am thinking of...they would have had to do 4 dives a day everyday for the last four years or so. As a point of reference, full-time divemasters who dive everyday for a living (in Cozumel for example) only log an average of 500 - 800 dives a year! That's 2 to 4 dives a day 304 days a year (taking into account that they get one to two days a week off. If they dove 4 dives a day, 304 days a year then they would log ovr 1000 dives...but even that is not realistic due to low season, occasional illness, etc.
My point is that it doesn't do anyone any good to lie about how many dives they have...it's pretty easy to tell when you're embellishing!
And in response to Ben, I've done some dives well over 100 times and like Preston, I try to dive other locales and envirnonments when I get the chance to. Still, 90% of my dives have been right here in Cozumel. I haven't yet done any cold water diving, but I"m hoping to change that next year and dive the Channel Islands.